Whenmeetingpeopleat的精選

問題詳情：閲讀下面材料，在空白處填入適當的內容（1個單詞）或括號內單詞的正確形式。Whenmeetingpeopleattheairport,mostpeoplesmileandshakehandswithpeopletheymeet.Weknowthatasmileisusuallyasignthatpeoplefeelfriend...